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Temperature Dependence of the Absorption Spectra and Optical Parameters in TGS and Cu 2+ ‐Doped TGS Crystals
Author(s) -
Abu ElFadl A.
Publication year - 1999
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/(sici)1521-4079(199909)34:8<1047::aid-crat1047>3.0.co;2-h
Subject(s) - absorption edge , atmospheric temperature range , doping , absorption (acoustics) , analytical chemistry (journal) , band gap , materials science , attenuation coefficient , absorption spectroscopy , spectral line , ion , range (aeronautics) , chemistry , optics , optoelectronics , thermodynamics , physics , organic chemistry , chromatography , astronomy , composite material
The effect of temperature on the optical absorption spectra and optical parameters is investigated for pure TGS and TGS doped with Cu 2+ ions. Absorption measurements cover the range from room temperature to about 355 K in the energy range 3‐5.5 eV. The temperature dependence of the band gap E g (T) reveals an anomaly at the phase transition temperature for both pure and Cu 2+ ‐doped TGS crystals. In the region of the absorption edge the absorption coefficient is found to display Urbach‐rule behaviour. The characteristic Urbach parameters are determined and their temperature dependence is investigated.